Fuel efficiency measuring system for fuel cell vehicle

A fuel efficiency measuring system for a fuel cell vehicle including a first hydrogen tank, an electronic scale configured to measure the weight of the hydrogen tank, at least one second vehicle hydrogen tank, and a stack, the fuel efficiency measuring system comprising:

• a pressure relief valve and a fourth valve installed in a second hydrogen supply line between the at least one vehicle side hydrogen tank and the stack;
• a first hydrogen supply line extending from an outlet end of the first hydrogen tank and directly connected to the second hydrogen supply line between the fourth valve and the stack;
• a regulator and a coupler connected to the outlet end of the first hydrogen tank;
• a first valve and a second valve mounted in series to the first hydrogen supply line extending from the coupler;
• a discharging unit installed in a branch line branched from the first hydrogen supply line and disposed between the first and second valves, the discharging unit configured to remove residual air within the first hydrogen supply line using hydrogen discharged from the vehicle side hydrogen tank, and
• a residual air discharging unit installed in a branch line branched from the first hydrogen supply between the first and second valves and configured to remove residual air within the first hydrogen supply line using hydrogen discharged from the vehicle side hydrogen tank;
• wherein the residual air discharging unit comprises:
• a check valve and a third valve mounted in series to the branch line;
• and
• a vent line extending from an outlet of the third valve to outside the fuel efficiency system.

A fuel efficiency measuring system for a fuel cell vehicle including a first hydrogen tank, an electronic scale configured to measure the weight of the hydrogen tank, at least one second vehicle hydrogen tank, and a stack, the fuel efficiency measuring system comprising:

• a pressure relief valve and a fourth valve installed in a second hydrogen supply line between the at least one vehicle side hydrogen tank and the stack;
• a first hydrogen supply line extending from an outlet end of the first hydrogen tank and directly connected to the second hydrogen supply line between the fourth valve and the stack;
• a regulator and a coupler connected to the outlet end of the first hydrogen tank;
• a first valve and a second valve mounted in series to the first hydrogen supply line extending from the coupler;
• a discharging unit installed in a branch line branched from the first hydrogen supply line and disposed between the first and second valves, the discharging unit configured to remove residual air within the first hydrogen supply line using hydrogen discharged from the vehicle side hydrogen tank;
• a safety valve mounted to the purge line at a predetermined position thereof;
• and
• wherein a hydrogen leak detecting sensor configured to detect leakage of hydrogen and transmit a signal to a controller is mounted into a housing in which the fuel efficiency measuring hydrogen tank is installed.